18+3a+9a=

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Solution for 18+3a+9a= equation: 


Simplifying
18 + 3a + 9a = 0

Combine like terms: 3a + 9a = 12a
18 + 12a = 0

Solving
18 + 12a = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-18' to each side of the equation.
18 + -18 + 12a = 0 + -18

Combine like terms: 18 + -18 = 0
0 + 12a = 0 + -18
12a = 0 + -18

Combine like terms: 0 + -18 = -18
12a = -18

Divide each side by '12'.
a = -1.5

Simplifying
a = -1.5

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